Subject: Dynamics Oddity... 2003-12-14 - By Karsten Bitter
Back
Yes,
normal direction would be my first guess too,
but about your curve from Illustrator:
if you're uncertain about it, just use it as a template
and draw a similar (Maya)curve on top of it
and try with that one...(and again, check for the normal direction
on the resulting surface).
regards,
Karsten
-- -- Original Message -- --
From: "Richard Brak" <r.brak_pb@(protected)>
To: <maya@(protected)>
Sent: Sunday, December 14, 2003 10:48 AM
Subject: Re: Dynamics Oddity...
> Are the tires normals pointing outwards? This can cause problems.
>
> Richard.
>
> > Here's the situation:
> >
> > I am creating a tire that is bouncing off the ground.
> >
> > Creating this should be simple as pie.
> >
> > I created my profile of the tire, revolved it and kept it a NURBS
> > body. I
> > deleted history off of the new NURBS object which is now in the shape
> > of my
> > tire.
> >
> > I created a ground plane along the XZ axis and I raised the tire above
> > the
> > plane.
> >
> > With the tire selected I added a Gravity field. I made the ground a
> > passive
> > rigid body.
> >
> > I let the simulation play.
> >
> > The tire falls and hits the ground and sticks there. Since this is a
> > tire I
> > need it to bounce. So I increase the bounciness of the rigidbody node
> > that
> > is on the tire to about 1.
> >
> > I play back the simulation and the same thing occurs.
> >
> > I increase the bounciness to 2.
> >
> > Now when I play the simulation back the tire falls, and when it hits
> > the
> > ground it disappears.
> >
> > Here is the thing...
> >
> > When I create a simple NURBS object, a cylinder, a sphere, a cube or
> > whatever and hook it up to the same gravity field, it behaves as
> > expected.
> > The object falls and bounces just as one would like it to do.
> >
> > So here's my question, why can't the tire behave like the primitive
> > objects?
> > There is nothing special about the tire. I even revolved it as a
> > polygon
> > object and the same results occur.
> >
> > Any ideas?
> >
> > I am running this on my Powerbook G4, 1Gig of RAM, Panther as the
> > operating
> > system. I have gone through the entire Dynamics book from Alias
> > without a
> > hitch. So I am confused as to why this seemingly simple thing behaves
> > like
> > this.
> >
> > Now one thing which should not be a factor but maybe it is... I made
> > the
> > tire profile in Illustrator and imported into Maya. Since the new
> > version of
> > Illustrator does not allow you to save out as older eps's anymore you
> > are
> > stuck using the straight Illustrator(.ai) import which seems to work
> > fine.
> > But maybe this somehow screws up how the geometry needs to behave for
> > the
> > dynamics engine to work.
> >
> > Any ideas? Any work around for this?
> >
> >
> > -
> > Scott h.
> >
> >
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